Device for turning crank-pins on engine-shafts.



A. THOMAS. DEVICE FOR TURNING CRANK PINS ON ENGINE SHAFTS. APPLICATIONFILED mu 25.19144 1,1 14,068. Patented 00b. 20, 1914;

2 SHEETS SHEET] WI TJVE SS ES:

A. THOMAS.

DEVICE FOR TURNING CRANK PINS 0N ENGINE SHAFTS.

APPLICATION FILED MAY 25,1914. 1,1 14,068. Patented 00a. 20, 1914.

2 BHEETS--SHEET 2 .H I I I.

WITNESSES? ATTOHA'E F.

I J" VEN TOR AUGUST THOMAS, OF SAIII. LAKE CITY, UTAH.

DEVICE FOR TURNING CRANK-PINS ON ENGINE-SHAFTS.

speciacation of Letters Patent.v

Patent-ed Oct. 20, 1914.

Application filed May 25, 1814. Serial No. 840,939.

To all whom it ma concern:

Be it known t at I, Atieusr THOMAS, a citizen of Germany, residin atSalt Lake City, in the county of Salt ake and State of Utah, haveinvented certain newand useful Im rovements in Devices for TurningCrankins on Engine-Shafts, of which the following is a specification.

My invention relates to devices for turn- "ing crank pins on the crankshafts of engines, and has for its object to provide a simple andefficient device which may be secured on a turning lathe of the'ordinarymake, by which a crank pin may be turned on the crank shaft of an enginewithout removing the shaft from the lathe or changin the axial point.-Tbese objects I accomplis with the device illustrated in theaccompanying drawings in which similar letters and numerals of referenceindicate like parts throughout the several fi res and as described inthe specification orming a part of this application and pointed out mthe appended claims.

In the drawiiws in which I have shown a substantial embodiment of myinvention,

Figure l is a fragmentary view in'elevation of a turning lathe with mydevice secured thereon in position to turn one-of the four crank pinsofthe crank shaft held in said I lathe. Fig. 2 is a side elevation of thedevice, looking in the direction of the arrow and on line w a: of Fig. 1with the crank shaft given one half turn. The position .of the device asshown in Fig. 1 is herein shown in dotted lines. Fig. 8 is a detail inside elevation of one element of the combined tool rest. Fig. 4 isairont elevation of the same and Fig. 5 a plan view. Fig. 6 is a. detailin side elevation of the tool stock housing. Fig. 7 is a front elevationof the same. Fig. 8 is a horizontal section on line 3/ y of Fig.

6. Fig. 9 .is a detail in side elevation of the centering guide case.Fig. 10 is a plan viewof the same. Fi 11 is a detail in'side elevationof one of t e gripping 'aws. Fig. 12 is a detail in side elevation o theopposin jaw. Fig. 13 is an end view of either of sai gripping jaws. Fig.14 is a plan view of the centering case wlth the gripping {aws removed.Fig. 15 is a detail in side e ovation of the same. I

My device is intended as an attachment tical standards 3 and 4 which arespaced apart and secured in parallel relation to each other by the headplates 5. V

A circular housing B is slidably-carried between and by said standards 3and 'l and a portion thereof is operated between said standards. Saidhousing consists of two semi-circular members 7 and 8 suitably fastenedtogether to form a circle of their inner peripheries. ,Each of saidmembers 7 and 8 has its inner periphery cut to form a V- shaped channel17 therein. One edge of said member 7 is extended to form a wing 9 whichis operable between said standards 3 and 4. On said win is rovided thetransversely dis osed gui e ri s 10 which are 0persted in -shapedchannels cut in the said standards 3 and 4. The outer end of said wing 9is laterally flanged to engage the edge'of said standard 4'. A channel11 is cut or is provided in one side of said wing and exten s as anopening in the said flanged portion, within which channel a tool stock12 is operated. The cutting tool 18 is secured in said stock 12, and theusual screw feed 14 is provided to adjust said cutting tool to its work.A circular guiding case 15 is operated within said housing B, and itsperipheric face is given an A-shapc as at 31 to engage within the saidV-shapcd channel 17 cut in the inner periphery of said housing. Oneportion of said guiding case 15 is extended to form a grip case 16, andthe face of said case 15 is cut out. Said grip case 16 is given acircular exterior on three sides and is cut out on the other side. Theinterior of said grip case is cut out in rectangular form as shown inFig. 9 to receive the shaft gripping elements shown in Figs. 11, 12, and15. The shaft centering and gripping elements consist of a U-shapedcentering case 18 with ortions of the, sides cut away to form shoal ers21 thereon. Set

screws 22 are provided in the side portions of said centering case toengage the engine shaft by which said shaft is firmly gri ped. Centeringpointers 23 are also dctachab y secured on said centering case by meansof which the axis of the intended crank in may be positioned relative tothe axis of t e shaft. The-gripping jaws 24 and 25 are provided tooperate within the said centering case by which the shaft is held inposition. They are adjusted and held in contact with the said shaft byset screws inserted through the openings 26 and 27. The assembling andoperation of m device is as follows :The commonly use tool post isremoved from the lathe and the vertical standards are fastened on thetool rest R by inserting the T-bolt 1 through the horizontal bracket rib2, a nut screwed on said bolt will hold said standards vertically inplace. The commonly used screw for movin" the tool rest transverselyacross the lathe is removed, this allows the tool rest and said verticalstandards 8 and 4 to move back and forth on the lathe as the movementsof the other elements of my device and the rotation of the shaft onwhich the pin is to be turned requires. The said semicircular members 7and 8 are fastened together around the said gluiding case 15 by thebolts, the A-sha e rib 31 on the peripheric face of sai guiding case 15engaging within the channel 17 in the inner ace of said members 7 and 8,this allows free rotation of said centerin case within housin 13. Thesaid housin is then inserted between said stander 3 and 4 by removingthe upper head plate 5 and insertin the wing 9 between said standards.Said wing is free moving u and down between said standards, this a lowsfree vertical movement of the said housing. as the rotation of the shaftrequires. h centering case 18 is insertedwithin said rip case 16 andsaid guiding case 15 tirou h the open face 0 the utter, the shoul era 21of the centering case 18 engaging the shoulders 20 of the guiding case15. The gripping jaw 25 is next inserted within the centering case 18and en aged by a set screw operated through the o e 27.

In using my device the shaft, having a in thereon to be turned, iscentered in the athe' in the usual manner and inserted through thedevice ad'acent the gripping .'aw 25. The size of t e pin to be turnedicing predetermined the pointers 23 are set as near the axial center asmay be and yet leave the portion of the crank shaft from which theintended crank pin is to be turned free. The distance from the axis ofthe shaft to the axis of the intended crank pin being known, the deviceis movedrelative 1,114,oee

e said to the said shaft until the centering pointer 23 on the side ofsaid centering case 18 is in lateral alinement with the axis of theintended pin and the other pointer 23 indicates that the pin axis is inits line. The device is then set firmly on the shaft by the othergripping jaw 24 as adjusted by the set screws 26 and 22. The pointers 23may then be removed, as ordinarily they are in the way when operatingthe lathe. The tool stock 12 and the cutting tool 13 are then broughtinto the cutting position by the usua screw feed 14. When the shaft isthen rotated the pin will be revolved therearound, and as so revolvedthe housing B and all the parts of the device will follow the pin in itsrevolutions, the vertical sliding of the wing portion of the housingbetween said standards and the horizontal sliding of the tool rests onthe lathe carriage allowi' such revolutions.

The device is moved longitudinally i the cutting work by the usualmovement of .the carriage on the bed of the lathe. The U-shapedcentering case remains in its fastened osition and does not movelongitudinally with the cutting elements.

Having thus described my invention I desire to secure by Letters Patentand claim 1. A device for turning crank pins integral with a crankshaft, comprising a lathe; means for rotating the shaft on its axis; acutting tool; a carrier for said tool; and means for securing thecarrier on the lathe which will allow limited lateral and verticalmovement of said carrier, said means consisting of a transverselymovable tool rest and a vertically movable housing.

2. An attachment for a lathe to turn crank pins integral with a crankshaft, con I prising a cutting tool; a carrier for ea, tool; means tosecure said carrier on t" lathe which will allow said carrier the samemovement as-is imparted to the pin, said means consisting of atransversely movable tool rest; a vertically movable housing; and meansto guide said carrier longitudinally along the pin, said meansconsisting of a guide case operable in said housing; and a grip caselaterally movable in said guide case.

3. An attachment for a lathe to turn crank pins integral with a crankshaft, comprising a cutting tool; a carrier for said tool; a tool resttransversely movable on the lathe; a vertically movable housing; a guidecase operable in said housing; a grip case laterally movable in saidguide case; and means to detachably fasten said grip case on said shaft.

4. An attachment for a turning lathe to i turn crank pins integral witha crank shaft,

mprising a tool for o erating on said pin; Tn testirnony whereof I haveafiixed my a carrier for said too a tool rest transsignature 1n presenceof two wltnesses. YBISGly movable on the lathe; a vertically AUGUSTTHOMAS. movable housing; a gmde case operable 1n 5 said housing; a gripcase laterally movable Witnesses:

insaid guide case; and means to detachably J ACOB Prmrrna, fasten saidgrip case on said shaft. MYRTIE NEBEKER.

Copies of this patent my be obtained tor flu cents each, by addressingthe Oommluioner of Patents,

Washington, I). 0.

